Returns a string of supported archive extensions.
A space-separated string of extensions suitable for use by the file validation system.
function archiver_get_extensions() {
$valid_extensions = array();
foreach (archiver_get_info() as $archive) {
foreach ($archive['extensions'] as $extension) {
foreach (explode('.', $extension) as $part) {
if (!in_array($part, $valid_extensions)) {
$valid_extensions[] = $part;
}
}
}
}
return implode(' ', $valid_extensions);
}